Writing-machine.



No. 825,198. PATENTED JULY 3, 1906. -S. H. DONALDSON.

WRITING MACHINE.

APPLICATION FILED MAE.27,1905.

warren s'rarns Ar ana orrron.

Specification of Letters Patent.

Patented July 3, 1906.

Application filed May 27,1905. Serial No. 252,427.

To all whom, zit may concern:

Be it known that I, SIDNEY HERBERT DON- ALDSON, a subject of the King of England, residing at 6 Boundary road, Swiss Cottage, London, England, have invented certain new and useful Improvements in or Relatin to Whiting-Machines; and I do hereby dec are the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention refers to a bottom-margin indicator for writing-machines.

With machines as hitherto constructed the most experienced operators have found that they are liable, especially when writingv quickly, to forget to'note when the paper is approaching the bottom, and consequently either to write over the bottom of the page or else to bring the last line of writing so near to the bottom of the page that the uniformit and neatness of the work is thereby spoile It is also frequently required in typing a number of circular-letters, for instance, that the matter should reach only to a certain depth in order to find room for a drawing, signature, or the like.

My present invention is designed to enable an. operator to determine exactly when the margin at the bottom of the page is of the re quired depth and to regulate such margin as required or to ascertain when any required depth has been reached.

The accompanying drawings show my invention as applied to a Yost writin -machine; but it may, with suitable -mo ifications, be applied to any of the other forms of writing-machines at present in the market.

In the drawings, Figure 1 is a plan of the left-hand end of the-carriage with my device attached theretoI ig. 2 is a view looking in the direction of the arrow, Fig. 1. Fig. 3 is a view showing the under side of the carriage with my device attached thereto.

The same letters of reference are employed to denote the same parts in all the views.

a shows the roller or platen round which the paper rolls. 6 is the spindle of same.

.0 is the milled head by means of which the platen is turned for the purpose of rolling the paper into position.

is a worm formed on or attached to the spindle b.

which springs over the said bar f and is secured by screws h. The plate is so secured that it turns on the bar f as a pivot or hinge. The plate 0 is curved or bent at i, where it comes over the spindle b, and a slot j is cut therein to enable the worm d to protrude through same.

k is a long triangular piece of metal with a sector cut thereon at Z. The said triangular or quadrantal piece of metal 7: is pivoted to the plate e at m, and'on the pivot m is also fastened a spring a, coming against or within the said triangular piece It and tending to bring the'triangular piece is back to its starting-point for writing each successive page.

0 is a pin which takes into holes p, of which there may be any suitable number, and g is a chain for holding the said pin 0 and preventing same from becoming lost.

1' is a handle which is attached to a spindle s, passing through the plate e. To the other end of the said spindle is attached a lockingpiece t for the purpose hereinafter mentioned.

a is a spring attached to the bottom of the plate e and bearing on the barf.

The action of the device'is as follows: The pin 0' is placed in the corresponding hole p, according to the length of the sheet of paper, depth of.margin required, or the exact posi tion on the paper of the last line of writing, and the plate 6 is locked in position by means '1". As the writing proceeds the worm d during rotation enga es with the sector Z on the trian ular iece i s and causes that piece to travel slow y toward the. pin 0, and when the paper reaches t e desired distance from the ottom margin t e said triangular piece com ing in contact witli'the pin 0 prevents the further rotation of the roller, and the operator on attempting to move the roller to commence a fresh line is at once advised of the fact that the writing on the sheet is within the desired distance of the bottom edge. The handle 1' is now turned so that the stop-piece t comes out of engagement with the bar], when the plate e springs up under the influence of the spring u and the triangular piece 7c is taken out of engagement with the worm d and flies back to the starting-point under the influence of the spring n. The plate is then again locked in position and is ready e is a plate which is attached to the bar f I of the carriage by means of a collar g,

for commencing a fresh page of writing.

If desired, a bell or other signal may be of the locking-piece t, actuated by the handle added, actuated by the triangular piece 7:; but in practice I find that the ocking of the platen is sufiicient indication.

ism operatively connected-with said platen and automatically limiting its rotation at a predetermined point thereof, means for disengaging saidmeehanism and platen, and means for automatically returning said mech anism to its normal position when so disen- 'gaged from said platen. v

2. The combination with the carriage and paper-feed mechanism of a typeWr-iting machine, of a lever pivotally supported on said carriage, operative connections between said lever and paper-feed mechanism'for swinging said lever on its pivot duringthe operation of said paper-feedmechanism, means for limiting the swing of said lever,-means for disconnecting said lever and paper-feed mechanism, and means for automatically returning said le'ver to its normal position when so disconnected.

3. The combination with the carriage and platen of a type-writing machine, of a detachable plate carried by said carriage, a le'- ver pivoted to said plate, means for actuating said lever b said platen, means for limitingthe'swing'o said lever, means for interlocking said plate to said carriage, and means for automatically'returning said lever to its normal position, when moved therefrom, upon unlocking said plate from said carriage.

In testimony whereof I afiix my signature in presence of two witnesses.

\ SIDNEY HERBERT DONAL-DSON.

Witnesses:

MAY DONALDSQN, A. FERRARI. 

